[Webkit-unassigned] [Bug 213842] New: Render glitch where divs are being hidden

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213842

            Bug ID: 213842
           Summary: Render glitch where divs are being hidden
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
               URL: https://bugreport2.zemtu.com
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pp at goli.at
                CC: bfulgham at webkit.org, pp at goli.at,
                    simon.fraser at apple.com, zalan at apple.com

Created attachment 403288

  --> https://bugs.webkit.org/attachment.cgi?id=403288&action=review

Animated GIF to illustrate the problem.

Steps to reproduce:

1. On Mobile Safari on iOS 13.5.1 open the URL https://bugreport2.zemtu.com
2. Touch scroll to the red rectangle and click on it
3. Press the arrow / back button
4. Some of the green rectangles on the top of the screen are no longer visible
5. Touch scroll just a little bit to make these rectangles visible again

Please retry several times as it may not occur all the time. Usually you have to try 2 - 4 times to see the problem.

This problem can also be reproduced in the XCode iOS simulator.

The problem cannot be reproduced under macOS Catalina 10.15.5 (19F101) in these browsers:
- Safari Version 13.1.1 (15609.2.9.1.2)
- Google Chrome Version 83.0.4103.116 (Offizieller Build) (64-Bit)
- Firefox 77.0.1 (64-Bit)
- Opera 68.0.3618.173
- Microsoft Edge 83.0.478.56 (Offizielles Build) (64-Bit)

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